|Pycanum rubens, an adult from the Gunung Mulu National Park, Malaysia
(Photo by Alan Cressler)
Lepeletier & Serville, 1825
Tessaratomids resemble large stink bugs (family Pentatomidae) and are sometimes quite colorful. Most tessaratomids are Old World, with only three species known from the Neotropics. Some members of Tessaratomidae exhibit maternal care of eggs and offspring. The defensive chemicals of certain species can cause significant damage if they come into contact with human skin; they may also cause temporary blindness.
Larger species of Tessaratomidae are known informally as giant shield bugs, giant stink bugs, or inflated stink bugs, but they generally do not have a collective common name and are referred to mostly as tessaratomids.
Tessaratomids are ovate to elongate-ovate bugs. They range in size from the smallest members of the tribe Sepinini at 6 to 7 mm (0.24 to 0.28 in), to the large Amissus atlas of tribe Tessaratomini at 43 to 45 mm (1.7 to 1.8 in). They are generally quite large and usually exceed 15 mm (0.59 in) in length.
The head of tessaratomids is generally small and triangular, with the antennae having 4 to 5 segments (though some of them, for example Siphnus, have relatively large heads). The scutellum (Latin for 'little shield', the hard extension of the thorax covering the abdomen in hemipterans) is triangular and does not cover the leathery middle section of the forewing but is often partially covered by the prothorax. The tarsi (the final segments of the legs) have 2 to 3 segments. They are most reliably distinguished from pentatomids by having six exposed abdominal spiracles instead of five.
Tessaratomids are oftentimes vividly colored.
All tessaratomids are phytophagous. They generally feed upon plants belonging to the plant orders Rosales and Sapindales, and spend most of their lives in tree leaves and stems. They exhibit incomplete metamorphosis and have lifespans that can be several years.
The eggs of tessaratomids are barrel-shaped or globular. The eggs exhibit a ring of small protuberances, known as micropylar process, which permit entry of sperm for fertilization into the eggs (through micropylar canals). They also provide openings for air for the developing embryos.
The eggs are laid in compact clusters glued to the leaves of a variety of plants. The laying arrangement can follow a pattern. For example, in Pygoplatys tenangau, the egg clusters are distinctively hexagonal; while in Piezosternum subulatum, they are arranged in two neat rows. The eggs are usually initially white, cream, or yellow in color but can change as the embryos inside mature.
As in other hemipterans, tessaratomids are hemimetabolic, undergoing incomplete metamorphosis. This means that they do not possess larval and pupal stages. Instead, juvenile tessaratomids (called nymphs), hatch directly from the eggs. The nymphs resemble fully grown adults except for size and the absence of wings.
Nymphs usually undergo four to five successive stages of moltings (ecdysis), increasing in size and becoming more adult-like with each stage until the final molting. The stages are individually known as instars, with the earliest stage (just after hatching) being known as the first nymphal instar. Nymphs may also differ significantly from adults in colors and patterns exhibited. In some species, nymphs often exhibit strikingly vibrant colors in contrast to the relative drabness of adults. The colors can also vary between instars.
Mating between adults can last for several hours, with the male and female attached end-to-end.
Maternal care is a well-documented presocial behavior among tessaratomids. Egg guarding by adult females were first observed in 1991 by S. Tachikawa among Japanese species of the genera Pygoplatys (subfamily Tessaratominae) and Erga (subfamily Oncomerinae).
In 1998, Gogala et al. described tessaratomines of the genus Pygoplatys from Thailand and Malaysia showing egg guarding behavior. In addition, they were also observed to exhibit another remarkable maternal behavior. A dense cluster of small nymphs were photographed being carried around by adult females. The nymphs were firmly clutching unto the bottom side of the abdomens of the adults and to each other, forming a compact mass. The females seem unimpeded by their burden and were able to walk around normally and even fly. The nymphs, however, were not observed feeding. This behavior is known as "nymphal phoresy" (used adjectivally as "phoretic").
In the Indonesian species Pygoplatys tenangau, females will cover the clutch of 70 to 120 eggs with their bodies after laying them, literally "standing guard" over them. When approached, they will spray defensive liquid at perceived attackers and may buzz their wings. They will not willingly abandon the eggs they are guarding, however, and if picked up will try to hold unto the leaf where their eggs are attached. It usually takes slightly more than two weeks for the eggs to hatch. The hatching process will take up 3 to 4 days, during which the newly hatched nymphs will immediately clamber unto their mother's abdomen. They were observed to remain phoretic for at least 17 days (Magnien et al., 2008).
In the subfamily Oncomerinae, a predominantly Australian group of large colorful bugs, brooding behavior varies from species which do not practice it at all (exhibited by Musgraveia sulciventris) to adult females carrying first and second instar nymphs on their abdomens (Monteith, 2011).
Oncomerines of the genera Cumare, Garceus, and Peltocopta exhibit the most advanced form of maternal care. Like the previously described Southeast Asian Pygoplatys individuals, the females actually carry young nymphs around on their abdomens. As the nymphs grow older, they eventually separate from their mothers, lose their bright colors, and become more solitary prior to molting into adults. Species which exhibit this behavior often have significantly flattened and expanded abdomens.
Of the Australian oncomerines, the bronze orange bug (Musgraveia sulciventris) is the only species unequivocally documented to lack maternal brooding behavior. This peculiarity might be connected to the unreliability of the food plant availability for the species (Monteith, 2011). Unlike other oncomerines who can only lay one egg clutch for the certain amount of time it takes to care for them, M. sulciventris can produce multiple egg clutches rapidly because females don't have to care for them. This allows M. sulciventris to rapidly expand their population when conditions are favorable.
Tesseratomids, like most heteropterans use chemical defenses (allomones), the source of the common name for pentatomoids - 'stink bugs'. When threatened, tessaratomids may squirt a strong jet of caustic liquid up to a distance of 15 to 27 centimetres (5.9 to 10.6 in).
The chemicals produced by heteropterans are usually alkanes and aldehydes from glands in the thorax. Compounds that are primarily for protection against fellow arthropods (to which they are lethal). However, the defensive chemicals of tessaratomids (particularly that of Tessaratoma papillosa and Musgraveia sulciventris) are notable for being one of the most debilitating to vertebrates, probably a defense specifically aimed against birds. They can cause damage to human skin and even cause temporary blindness if sprayed unto the eyes.
In Lyramoprha parens, nymphs are also known to be highly gregarious, forming massed feeding groups and moving to new feeding sites in close-packed groups. This behavior, along with their bright colorations and stink glands is believed to help in discouraging potential predators.
Aggregation behavior is also common in adults in some species. Aside from combined chemical defenses, other possible benefits of aggregation include better mating opportunities and shelter, greater retention of moisture and heat, and a possible sense of security. Lone bugs in some species were known to be more likely to be skittish than bugs in groups. However, aggregation can also increase the threats of diseases, parasites, and parasitoids.
Parasitoid wasps that parasitize tessaratomids usually come from the families Eupelmidae, Scelionidae, and Encyrtidae. Adult female parasitoid wasps will search out eggs laid by tessaratomoids. Upon finding some, they will thrust their ovipositors into them and lay eggs inside. The eggs of parasitoid wasps hatch and develop inside the tessaratomid eggs, feeding on the tessaratomid embryo and eventually killing it. Infested eggs characteristically turn darker in color as the wasp larva matures. After about a week, one or more adult wasps will then emerge from the now empty egg.
Musgraveia sulciventris is parasitized by the wasps Eupelmus poggioni and Telenomus spp.; Tessaratoma javanica by the wasps Anastatus colemani and Anastatus kashmirensis(?); and the lychee giant stink bug Tessaratoma papillosa by the wasps Ooencyrtus phongi, Anastatus spp. (particularly Anastatus japonicus), and Trissolcus spp. (particularly Trissolcus latisulcus).
In tessaratomids considered to be agricultural pests (like the Musgraveia sulciventris and Tessaratoma papillosa), the wasps that parasitize them are being studied as potential biological control agents. In the Fujian, Guangdong, and Guangxi provinces of China, mass-reared Anastatus japonicus are being released to combat Tessaratoma papillosa pests in lychee and longan crops. The same measures are also reportedly being done in Thailand.
The edible stink bug Encosternum delegorguei is consumed as human food in Zimbabwe and among the Venda people of South Africa. The insects are light green in color and quite large, averaging at 25 mm (0.98 in) in length. They are most widely known in South Africa as "thongolifha", though they are also known as "tsonônô". In Zimbabwe, they are known as "harurwa" or "harugwa".
Encosternum delegorguei are collected just before dawn when they are least active and are easier to catch. They are caught carefully, taking care not to kill them. The chemicals released by the bugs can often stain the hands of collectors orange if they collect them barehanded. The bugs which died during collection are carefully separated from live bugs. This is because the chemicals stored in the stink glands are unpalatable - being extremely bitter. As dead bugs can not release the remaining chemicals in their bodies, they are deemed unsuitable for consumption and discarded. The remaining live bugs are placed in a bucket with a small amount of warm water. This is then carefully agitated so as to make them release all their defense chemicals in alarm. This is repeated several more times until their stink glands are drained.
The live bugs with their now empty stink glands are then boiled in water. Further sorting is done afterwards. Dead bugs which died before they could release all their chemicals can be distinguished from the 'clean' bugs by their blackened abdomens after boiling. These are also rejected. The remaining bugs are then dried under the sun.
In cases where the bugs were collected dead, another method is used to remove the chemicals. The bugs are beheaded and carefully squeezed so chemicals in their stink glands flow out the severed neck. The liquids secreted are then wiped off and the bugs boiled and sun-dried like the previous procedure.
Diminishing harvests of E. delegorguei has been a cause for concern in recent years. It may be due to the decline in the number of available food plants which are being harvested locally for firewood. Studies are being done in South Africa for ways to ensure sustainable harvests of E. delegorguei, as well as for the possibilities of rearing them in captivity for human consumption.
In Laos, Tessaratoma quadrata, locally known as "mien kieng" are also eaten. The same species is also eaten among the Galo people of Northeast India where they are known as "tari". Only adults are consumed. The wings are removed and the bugs eaten raw or cooked into chutney.
As agricultural pests
Lychee giant stink bugs, Tessaratoma papillosa, are destructive pests of lychee trees (Litchi chinensis) in China. They also feed on the closely related Sapindaceae fruit trees like longan (Dimocarpus longan) and rambutan (Nephelium lappaceum). The closely related Tessaratoma quadrata and Tessaratoma javanica are also minor pests of apple, pear, and lychee trees.
|Top left: A first instar nymph of the lychee giant shield bug (Tessaratoma papillosa) from China; Right: Vividly colored older nymph of the same species; Bottom left: The drably colored adult.
(Photo by Charles Lam)
Bronze orange bugs (Musgraveia sulciventris) are serious pests to citrus crops in Australia. They are very large bugs, around 20 mm (0.79 in) in length, whose native host plants are members of the rue family, Rutaceae.
In Indonesia, the tessaratomid Pygoplatys tenangau, locally known as the "tenangau", is considered to be one of the most important pests of Damar gardens. Damar gardens are cultivated forests of trees of the genera Shorea, Balanocarpus, or Hopea used as a source of Damar resin. P. tenangau is the only known tessaratomid which feeds on Dipterocarpaceae.
In Papua New Guinea, Agapophyta viridula and Agapophyta similis are regarded as pests of Tephrosia spp. and pigeon peas (Cajanus cajan). Agapophyta bipunctata are known minor pests of coconuts (Cocos nucifera) and sago (Metroxylon sagu) as well.
Classification and distribution
Tessaratomidae was first described as a family group by the Swedish entomologist Carl Stål in 1864. In 1900, the Hungarian entomologist Géza Horváth divided the family into 9 tribes and established a key to determining genera. The English entomologist George Willis Kirkaldy increased the number of subfamilies under Tessaratomidae to 11 in 1909. Dennis Leston (1955) followed Kirkaldy's system but reclassified some tribes to subtribes. The current classification is based on the work of Pramod Kumar in 1969 who reduced the number of subfamilies to three - Natalicolinae, Oncomerinae, and Tessaratominae; with Tessaratominae being further divided into three tribes - Prionogastrini, Sepinini and Tessaratomini. Subsequent revisions by Sinclair (1989), Rolston et al. (1993), Schuch & Slater (1995), Sinclair (2000), Cassis & Gross (2002), and Rider (2006), are all based upon Kumar's system.
Tessaratomidae is classified under order Hemiptera (true bugs), suborder Heteroptera, infraorder Pentatomomorpha, and superfamily Pentatomoidea (shield bugs and stink bugs). It is currently divided into three subfamilies: Natalicolinae (with 8 genera), Oncomerinae (with 15 genera), and Tessaratominae (with 33 genera and one of uncertain placement).
- Agapophyta - Australia, Moluccas, New Guinea, Solomon Islands
- Cumare - Australia (Queensland)
- Erga - Australia
- Garceus - Australia (Queensland)
- Lyramorpha - Australia, Moluccas, and New Guinea
- Musgraveia - Australia
- Neosalica - Myanmar, China, India, Sumatra, and Vietnam
- Oncomeris - Australia, Lesser Sunda Islands, Moluccas, New Guinea, Sulawesi
- Peltocopta - Australia
- Piezosternum - Africa, Cape Verde Islands, Central America and the Caribbean, Madagascar, South America
- Plisthenes - Australia, New Guinea, Solomon Islands, Southeast Asia
- Rhoecus - Australia
- Stilida - Australia
- Tamolia - New Guinea
- Tibiospina - Australia (Queensland)
- Prionogaster - South Africa
- Platytatus - Madagascar
- Subtribe Sepinaria Horváth, 1900 - type genus: Sepina Signoret, 1861
- Anacanthopus - Philippines
- Asiarcha - China, India, Indochina
- Aurungabada - India (Bombay)
- Candace - West Africa
- Carpona - China, India, Southeast Asia
- Dalcantha - India, Southeast Asia
- Eurostus - East Asia, South Asia, Southeast Asia
- Eurypleura - Indonesia (Java and Sumatra)
- Eusthenes - East Asia, South Asia, Southeast Asia
- Eusthenimorpha - China
- Mattiphus - China, Indochina, Philippines, Sri Lanka, Sulawesi, Sumatra
- Megaedoeum - West Africa
- Origanaus - China
- Pseudopycanum - Malaysia
- Pycanum - East Asia, South Asia, Southeast Asia
- Sanganus - Borneo, New Guinea, Sumatra
- Serrocarpona - Sulawesi
- Acidosterna - Malaysia, Sumatra
- Amissus - Southeast Asia
- Embolosterna - East Asia, South Asia, Southeast Asia
- Enada - Borneo
- Hypencha - Southeast Asia
- Mucanum - Southeast Asia
- Pygoplatys - South and Southeast Asia
- Siphnus - Southeast Asia
- Tessaratoma - Africa, Australia, South Asia, East Asia, Southeast Asia
A fossil specimen, named Tesseratomoides maximus and thought to belong to Tessaratomidae, was recovered in 1967 from the Eocene of Germany; but the specimen was published with no formal description and is thus unacceptable as a valid taxon. Another fossil genus, Latahcoris, from the Miocene Latah Formation of Idaho, was described in 1931 by T.D.A. Cockerell.
A study on the phylogenetic relationships of the superfamily Pentatomoidea in 2008 hints that Tessaratomidae and Dinidoridae represented a monophyletic group. However, the difficulty in securing enough materials for examination for both groups leaves this as yet unresolved.
Below is the morphological unweighted tree of the superfamily Pentatomoidea after Grazia et al. (2008). Tessaratomidae is in bold. Both Dinidoridae and Tessaratomidae are shown in dotted lines, signifying uncertain status.
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|Wikimedia Commons has media related to Tessaratomidae.|
|Wikispecies has information related to: Tessaratomidae|
- Illustrated catalog of Tessaratomidae, maintained by Philippe Magnien
- Tessaratomids of Australia from Save Our Waterways Now
- Family Tessaratomidae - Large Stink Bugs from Brisbane Insects and Spiders
- Pentatomoidea Home page, maintained by David A. Rider